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✔【Multiple gas detection】-- gas leak detector suitable for methane, natural gas, biogas, propane, gas fuel, artificial gas, liquefied petroleum gas, liquefied natural gas, etc...Gas leak detector suitable for almost all applications with combustible gases, mists, and residues, the natural gas detector for the detection of flammable gases, such as gas pipelines, fuel leaks, an inspection of leaks at the access✔【Powerful quality & functionality】-- natural gas detector adopting high-quality semiconductor calefaction type sensor. Gas leak detector visual and audible alarm function MCU intelligent supervise control and smart chip technology, gas leak detector led's (visual) and 85Db audible alerts that increase with gas concentration✔【Sensitive Detection 】--This gas leak detector precisely measures and displays concentration of combustible gas as an easy-to-read percentage from 1000 to 9999 of PPM. View the concentration of combustible gas on the LED screen before it reaches its explosive concentration level. Not displayed below 1000PPM（No fire hazard）, 1000-2500PPM Warning Alarm: DI-DI-DI, 2500-9999PPM flash alarm, continuous alarm above 9999PPM✔【High-decibel alarm】-- when the natural gas concentration is higher than the upper limit set value, natural gas leak detector an alarm signal of 85 decibels or more is immediately issued, natural gas leak detector continuous alarm signal. Make sure everyone at home can hear and protect your safety✔【Quality Assurance】-- If you are unhappy with our natural gas leak detector , please contact us (even if outside the Amazon return window) for a new natural gas leak detector or a full refund. We want our customers to be happy with their purchase and we work hard to guarantee the best customer purchase